There is a lot of tax-loss selling in Halozyme Therapeutics, Inc. (NASDAQ: HALO) and it's a really speculative stock, said Cramer.

Roku Inc (NASDAQ: ROKU) is one of the most amazing short squeezes Cramer has ever seen. He explained that a lot of people are betting against the stock, because of Amazon.com, Inc. (NASDAQ: AMZN) competition.